Answer

The answer is below.

Work Step by Step

The student accidentally did the following:
$$-6 + (-8) \div 2 \\ 54 / 2 =27$$
First of all, the student thought that the addition symbol was a multiplication symbol. Then, they incorrectly multiplied 6 and 8 to get 54. Here is how you do it correctly:
$$ = -6 + (-4) \\ -10$$
Note, it is important to divide the -8 by two before performing addition.